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User Story 38734: Add 6.0.2 context to 7.0.0-P1 Release Notes (#3633)
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‎release-notes/7.0/7.0.0-preview1.md‎

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## Preview Release 7.0.0-preview1.25257.1 - 2025-09-12
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## Changes Since [6.1.0](../6.1/6.1.0.md)
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This update brings the following changes since the [6.1.0](../6.1/6.1.0.md)
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release:
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- Updated `Azure.Identity` dependency to v1.14.2.
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([#3538](https://github.com/dotnet/SqlClient/pull/3538))
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## Changes Since [6.0.2](../6.0/6.0.2.md)
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This update brings the following changes since the [6.0.2](../6.0/6.0.2.md)
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release. Changes already noted above are omitted:
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### Additions
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#### Added dedicated SQL Server vector datatype support
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*What Changed:*
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- Optimized vector communications between MDS and SQL Server 2025, employing a
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custom binary format over the TDS protocol.
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([#3433](https://github.com/dotnet/SqlClient/pull/3433),
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[#3443](https://github.com/dotnet/SqlClient/pull/3443))
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- Reduced processing load compared to existing JSON-based vector support.
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- Initial support for 32-bit single-precision floating point vectors.
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*Who Benefits:*
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- Applications moving large vector data sets will see beneficial improvements
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to processing times and memory requirements.
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- Vector-specific APIs are ready to support future numeric representations with
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a consistent look-and-feel.
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*Impact:*
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- Reduced transmission and processing times for vector operations versus JSON
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using SQL Server 2025 preview:
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- Reads: 50x improvement
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- Writes: 3.3x improvement
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- Bulk Copy: 19x improvement
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- (Observed with vector column of max 1998 size, and 10,000 records for each
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operation.)
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- Improved memory footprint due to the elimination of JSON
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serialization/deserialization and string representation bloat.
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- For backwards compatibility with earlier SQL Server Vector implementations,
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applications may continue to use JSON strings to send/receive vector data,
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although they will not see any of the performance improvements noted above.
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#### Revived .NET Standard 2.0 target support
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*What Changed:*
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- Support for targeting .NET Standard 2.0 has returned.
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([#3381](https://github.com/dotnet/SqlClient/pull/3381))
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- Support had previously been removed in the 6.0 release, with the
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[community voicing concerns](https://github.com/dotnet/SqlClient/discussions/3115).
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*Who Benefits:*
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- Libraries that depend on MDS may seamlessly target any of the following
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frameworks:
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- .NET Standard 2.0
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- .NET Framework 4.6.2 and above
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- .NET 8.0
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- .NET 9.0
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- Applications should continue to target runtimes.
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- The MDS .NET Standard 2.0 target framework support does not include an
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actual implementation, and cannot be used with a runtime.
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- An application's build/publish process should always pick the appropriate
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MDS .NET/.NET Framework runtime implementation.
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- Custom build/publish actions that incorrectly try to deploy the MDS .NET
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Standard 2.0 reference DLL at runtime are not supported.
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*Impact:*
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- Libraries targeting .NET Standard 2.0 will no longer receive warnings like
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this:
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- `warning NU1701: Package 'Microsoft.Data.SqlClient 6.0.2' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework '.NETStandard,Version=v2.0'. This package may not be fully compatible with your project.`
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#### Other Additions
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- Added packet multiplexing support to improve large data read performance.
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([#2714](https://github.com/dotnet/SqlClient/pull/2714),
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[#3161](https://github.com/dotnet/SqlClient/pull/3161),
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[#3202](https://github.com/dotnet/SqlClient/pull/3202))
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- Added support for special casing with Fabric endpoints.
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([#3084](https://github.com/dotnet/SqlClient/pull/3084))
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### Fixed
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- Fixed distributed transactions to be preserved during pooled connection resets.
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([#3019](https://github.com/dotnet/SqlClient/pull/3019))
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- Fixed application crash when the `Data Source` parameter begins with a comma.
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([#3250](https://github.com/dotnet/SqlClient/pull/3250))
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- Resolved synonym count discrepancies in debug mode.
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([#3098](https://github.com/dotnet/SqlClient/pull/3098))
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- Addressed warnings for down-level SSL/TLS versions.
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([#3126](https://github.com/dotnet/SqlClient/pull/3126))
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- Fixed missing <NeutralLanguage> property.
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([#3325](https://github.com/dotnet/SqlClient/pull/3325))
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- Fixed injection of UTF-8 BOM during bulk copy.
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([#3399](https://github.com/dotnet/SqlClient/pull/3399))
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- Fixed `SqlCachedBuffer` async read edge case.
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([#3329](https://github.com/dotnet/SqlClient/pull/3329))
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- Fixed `SqlSequentialTextReader` edge case with single-byte reads.
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([#3383](https://github.com/dotnet/SqlClient/pull/3383))
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- Fixed an incorrect error message when parsing connection string `PoolBlockingPeriod`.
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([#3411](https://github.com/dotnet/SqlClient/pull/3411))
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- Added missing `ToString()` override to `SqlJson`.
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([#3427](https://github.com/dotnet/SqlClient/pull/3427))
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- Fixed missing socket error codes on non-Windows platforms.
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([#3475](https://github.com/dotnet/SqlClient/pull/3475))
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- Fixed primary/secondary server SPN handling during SSPI negotiation.
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([#3478](https://github.com/dotnet/SqlClient/pull/3478))
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- Fixed AzureKeyVaultProvider package key caching to serialize Azure key fetch
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operations.
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([#3477](https://github.com/dotnet/SqlClient/pull/3477))
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- Fixed a rare error related to multi-packet async text reads.
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([#3474](https://github.com/dotnet/SqlClient/pull/3474))
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- Fixed some spelling errors in the API docs.
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([#3500](https://github.com/dotnet/SqlClient/pull/3500))
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- Fixed a rare multi-packet string corruption bug.
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([#3513](https://github.com/dotnet/SqlClient/pull/3513))
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### Changed
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#### SqlDecimal type workarounds conversions
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*What Changed:*
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- Changed how SqlDecimal type workarounds perform conversions to meet
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compliance policies.
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([#3467](https://github.com/dotnet/SqlClient/pull/3467))
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*Who Benefits:*
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- Microsoft products must not use undocumented APIs on other Microsoft products.
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This change removes calls to undocumented APIs and replaces them with
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compliant API use.
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*Impact:*
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- These changes impose an observed 5% decrease in performance on .NET Framework.
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#### SqlVector API improvements (since [6.1.0-preview2](6.1.0-preview2.md))
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*What Changed:*
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- Several changes were made to the SqlVector API published in the
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[6.1.0-preview2](6.1.0-preview2.md) release
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([#3472](https://github.com/dotnet/SqlClient/pull/3472)):
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- The SqlVector class was changed to a readonly struct.
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- The null value constructor was changed to a static `CreateNull()` method.
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- The `Size` property was removed.
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*Who Benefits:*
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- SqlVector instances gain the efficiencies of struct handling.
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*Impact:*
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- Early-adopter applications may require updates if they rely on the old APIs
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and any class-specific behaviour.
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#### Other Changes
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- Reduced allocations when opening a connection.
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([#3364](https://github.com/dotnet/SqlClient/pull/3364))
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- Various performance improvements related to TDS parsing.
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([#3337](https://github.com/dotnet/SqlClient/pull/3337),
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[#3377](https://github.com/dotnet/SqlClient/pull/3377),
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[#3422](https://github.com/dotnet/SqlClient/pull/3422))
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- Improved native AOT support.
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([#3364](https://github.com/dotnet/SqlClient/pull/3364),
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[#3369](https://github.com/dotnet/SqlClient/pull/3369),
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[#3401](https://github.com/dotnet/SqlClient/pull/3401))
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- Progress towards [SSPI extensibility](https://github.com/dotnet/SqlClient/issues/2253).
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([#2454](https://github.com/dotnet/SqlClient/pull/2454))
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- Progress towards [connection pooling improvements](https://github.com/dotnet/SqlClient/issues/3356).
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([#3352](https://github.com/dotnet/SqlClient/pull/3352),
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[#3396](https://github.com/dotnet/SqlClient/pull/3396))
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- Expanded/clarified SqlConnection's
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[AccessToken](https://learn.microsoft.com/en-us/dotnet/api/microsoft.data.sqlclient.sqlconnection.accesstoken) and
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[AccessTokenCallback](https://learn.microsoft.com/en-us/dotnet/api/microsoft.data.sqlclient.sqlconnection.accesstokencallback)
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documentation.
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([#3339](https://github.com/dotnet/SqlClient/pull/3339))
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- Fixed some poorly formatted tables in the API docs.
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([#3391](https://github.com/dotnet/SqlClient/pull/3391))
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- Optimized binary size for AOT.
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([#3091](https://github.com/dotnet/SqlClient/pull/3091))
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- Refined bulk copy operations to handle unmatched column names more effectively.
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([#3205](https://github.com/dotnet/SqlClient/pull/3205))
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- Enhanced `SqlBulkCopy` to explicitly identify mismatched column names.
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([#3183](https://github.com/dotnet/SqlClient/pull/3183))
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- Optimized outgoing SSPI blob handling using `IBufferWriter<byte>`.
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([#2452](https://github.com/dotnet/SqlClient/pull/2452))
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- Replaced `byte[]` with `string` for SNI to improve efficiency.
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([#2790](https://github.com/dotnet/SqlClient/pull/2790))
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- Code cleanup to remove SQL 2000 support.
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([#2839](https://github.com/dotnet/SqlClient/pull/2839),
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[#3206](https://github.com/dotnet/SqlClient/pull/3206),
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[#3217](https://github.com/dotnet/SqlClient/pull/3217))
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- Connection pool design refactor for a modular connection pool design.
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([#3199](https://github.com/dotnet/SqlClient/pull/3199))
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- Added dependency on `System.Text.Json`
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[8.0.5](https://www.nuget.org/packages/System.Text.Json/8.0.5) (.NET 8.0) and
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[9.0.5](https://www.nuget.org/packages/System.Text.Json/9.0.5) (.NET Standard 2.0, .NET 9.0)
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to avoid transitive vulnerabilities ([CVE-2024-43485](https://github.com/advisories/GHSA-8g4q-xg66-9fp4)).
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([#3403](https://github.com/dotnet/SqlClient/pull/3403))
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- Updated various dependencies [#3229](https://github.com/dotnet/SqlClient/pull/3229), primarily:
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- System.Text.Encodings.Web to v8.0.0
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- System.Text.Json to v8.0.5
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- Azure.Identity to v1.13.2
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- Microsoft.Identity.Model.Json.Web.Tokens to v7.7.1
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- Microsoft.Identity.Model.Protocols.OpenIdConnect to v7.7.1
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- Code merge towards a unified SqlClient project, aligning .NET Framework and .NET Core implementations.
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(Many PRs - see [6.1.0-preview1](6.1.0-preview1.md) and [6.1.0-preview2](6.1.0-preview2.md) for details.)
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- Test improvements include a new unit test project, updates to test
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dependencies, removal of hardcoded credentials, and improved robustness.
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(Many PRs - see [6.1.0-preview1](6.1.0-preview1.md) and [6.1.0-preview2](6.1.0-preview2.md) for details.)
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## Contributors
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We thank the following public contributors. Their efforts toward this project
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- [edwardneal](https://github.com/edwardneal)
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- [emmanuel-ferdman](https://github.com/emmanuel-ferdman)
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- [ErikEJ](https://github.com/ErikEJ)
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- [MichelZ](https://github.com/MichelZ)
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- [twsouthwick](https://github.com/twsouthwick)
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- [Wraith2](https://github.com/Wraith2)
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### New Contributors
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- [frankbuckley](https://github.com/frankbuckley) made their first contribution
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in [#3521](https://github.com/dotnet/SqlClient/pull/3521)
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- [BradBarnich](https://github.com/BradBarnich) made their first contribution in
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[#3325](https://github.com/dotnet/SqlClient/pull/3325)
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- [deusanyjunior](https://github.com/deusanyjunior) made their first contribution in
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[#3310](https://github.com/dotnet/SqlClient/pull/3310)
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- [emmanuel-ferdman](https://github.com/emmanuel-ferdman) made their first contribution in
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[#3041](https://github.com/dotnet/SqlClient/pull/3041)
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- [frankbuckley](https://github.com/frankbuckley) made their first contribution in
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[#3521](https://github.com/dotnet/SqlClient/pull/3521)
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- [JNjenga](https://github.com/JNjenga) made their first contribution in
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[#3183](https://github.com/dotnet/SqlClient/pull/3183)
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- [MaceWindu](https://github.com/MaceWindu) made their first contribution in
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[#3134](https://github.com/dotnet/SqlClient/pull/3134)
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- [Midhunnnk](https://github.com/Midhunnnk) made their first contribution in
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[#3250](https://github.com/dotnet/SqlClient/pull/3250)
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## Target Platform Support
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